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We observed surface and electronic structure of LaO0.5F0.5BiSe2 singlecrystal by scanning tunneling microscopy/spectroscopy (STM/STS) at 4.2 K.Square lattice composed of Bi atoms was observed at a positive sample biasvoltage on the surface prepared by cleavage. At a negative sample bias voltage,a stripe structure running along Bi-Bi directions was observed as in theprevious report on NdO0.7F0.3BiS2. Furthermore, we observed a supermodulationrunning along the diagonal directions with the period of about 5 times of thelattice constant. This seems to be indicative of structural instability of thissystem rather than electronic instability attributed to a nesting picture.

Observation of supermodulation in LaO0.5F0.5BiSe2 by scanning tunneling microscopy and spectroscopy